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Closed loop (compensated) current transducer using the Hall effect
| Conversion Ratio (KN) | 1 : 5000 |
| Secondary Nominal RMS Current (ISN) | 200 mA |
| Response Time to 90 % of IPN Step | < 1 µs |
| Isolation Test Voltage (50 Hz, 1 min) | 13.4 kV |
| Operating Temperature Range | −40 ... +85 °C |
| Secondary Coil Resistance @ 85 °C | 44 Ω |
Single or three phase inverter, Propulsion and braking chopper, Propulsion converter, Auxiliary converter, Battery charger. Application Domain, Railway (fixed installations and onboard).
The LTC 1000-S/SP28 is a closed loop (compensated) current transducer from LEM for the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation.
It offers excellent accuracy, very good linearity, low temperature drift and wide frequency bandwidth. Typical applications include Single or three phase inverter, Propulsion and braking chopper, Propulsion converter and Auxiliary converter.
Key characteristics from the official datasheet: total error ±0.4 %; linearity error < 0.1 %; frequency bandwidth DC ... 100 kHz; operating temperature −40 ... +85 °C; nominal secondary output 200 mA.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | LTC |
| Product Reference | LTC 1000-S/SP28 |
| Primary Nominal Current | 1000 A |
| Supply Voltage | ±15 ... 24 V |
| Measurement | currents: DC, AC, pulsed... |
| Mounting | Busbar Mount |
| Application Domain | Railway (fixed installations and onboard) |
| Electrical Data — LTC 1000-S/SP28 | |
|---|---|
| Primary Nominal RMS Current (IPN) | 1000 A |
| Primary Current, Measuring Range (IPM) | @ ±24 V 0I |
| Secondary Nominal RMS Current (ISN) | 200 mA |
| Conversion Ratio (KN) | 1 : 5000 |
| Supply Voltage (UC) | ±15 ... 24 V |
| Current Consumption (IC) | 32 (@ ±24 V) + IS mA |
| Turns Ratio (NP/NS) | 1 : 5000 |
| Accuracy & Dynamic Performance | |
|---|---|
| Overall Accuracy @ IPN, TA = 25 °C (XG) | ± 0.4 % |
| Linearity Error (εL) | < 0.1 % |
| Offset Current @ IP = 0, TA = 25 °C (IO) | ± 0.5 mA |
| Temperature Variation of IO (Max) | ± 1 mA |
| Response Time to 90 % of IPN Step (tr) | < 1 µs |
| Frequency Bandwidth (-1 dB) (BW) | DC ... 100 kHz |
| Total Error (εtot) @ IPN | ±0.4 % |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 13.4 kV |
| Comparative Tracking Index (CTI) | 600 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | −40 ... +85 °C |
| Ambient Storage Temperature (TA st) | −45 ... +90 °C |
| Secondary Coil Resistance @ TA = 85 °C (RS) | 44 Ω |
| Mass (m) | 785 g |
| General Tolerance | ±1 mm |
| Standards & Certifications | |
|---|---|
| EN 50155 | 20173) |
Note: Specifications are taken from the official LTC 1000-S/SP28 datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the LTC 1000-S/SP28.
Outline dimensions, pin layout and connection diagrams of the LTC 1000-S/SP28 are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| General Tolerance | ±1 mm |
| Mass | 785 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the LTC 1000-S/SP28.
Characteristic curve diagrams are not included in the LTC 1000-S/SP28 datasheet; the relevant characteristics are the accuracy and dynamic performance data listed below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Overall Accuracy @ IPN, TA = 25 °C (XG) | ± 0.4 % |
| Linearity Error (εL) | < 0.1 % |
| Response Time to 90 % of IPN Step (tr) | < 1 µs |
| Frequency Bandwidth (-1 dB) (BW) | DC ... 100 kHz |
| Total Error (εtot) @ IPN | ±0.4 % |
Note: For the full set of performance data, refer to the datasheet.
Other models of the LT Series share the same measurement principle, mounting concept and output interface family.
